<template>
  <div class="todo-footer" v-show="total>0">
    <label>
      <input type="checkbox" v-model="isAll" />
    </label>
    <span>
          <span>已完成{{ doneTotal }}</span> / 全部{{ total }}
        </span>
    <button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
  </div>
</template>

<script>
export default {
  name: "MyFooter",
  description: '',
  mixins: [],
  components: {},
  props: ['todos'],
  data() {
    return {}
  },
  computed: {
    total() {
      return this.todos.length
    },
    doneTotal() {
      return this.todos.reduce((pre, current) => {
        return pre + (current.done ? 1 : 0)
      }, 0)
    },
    isAll:{
      get(){
        return this.total == this.doneTotal && this.total > 0
      },
      set(value){
        this.$emit('checkAllTodo',value)
      }
    },

  },
  watch: {},
  filters: {},
  created() {
  },
  mounted() {
  },
  destroyed() {
  },
  methods: {
    clearAll(){
      this.$emit('clearAllTodo')
    }
  }
}
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>